What is the temperature at the upper level of the mesosphere?

The temperature at the upper level of the mesosphere can reach around -130°F. The mesosphere is the third layer of Earth's atmosphere, situated above the stratosphere and below the thermosphere. In this layer, temperature decreases with altitude, and at its upper boundary, which is roughly around 50 to 85 kilometers (31 to 53 miles) above sea level, temperatures can drop to extreme lows, approximately -130°F.

The other temperature options do not accurately reflect the conditions in the upper mesosphere. For example, -76°F and -40°F are closer to temperatures found in lower atmospheric layers or regions of the upper mesosphere but do not represent the most extreme cold typically experienced higher up in this layer. 32°F, which denotes the freezing point of water, is far warmer than the conditions encountered in this region of the atmosphere. Thus, -130°F is representative of the harsh cold conditions associated with the upper mesosphere's altitude.